Valve for operating a pair of related devices



Nov. 17, 1959 Filed June 24, 1957 K. S. TAN

VALVE FOR OPERATING A PAIR OF RELATED DEVICES 2 Sheets-Sheet l fzzdzzfor F t 46 A .59, 4.9 mi

I 56 H. '1 l flgfzezqg Tan 7 Nov. 17, 1959 K. s. Tm 2,912,826

7 VALVE FOR OPERATING A PAIR OF RELATED DEVI CES Filed June 24. 1957 2Sheets-Sheet 2 7?]? e229 Tan Mm W oQfiorz-zey United States Patent 6VALVE FOR OPERATING A PAIR OF RELATED DEVICES Kheng S. Tan, MelrosePark, Ill., assignor to International Harvester Company, Chicago, 11].,a corporation of New Jersey Application June 24, 1957, Serial No.667,329

4 Claims. (Cl. 60-97) apron and ejector of a scraper.

An object of the invention is to provide a valve that incorporates twovalves into one.

Another object of the invention is to provide a valve that is compactand small and is inexpensive to make and whose parts can be replacedeasily.

A further object of the invention is to provide a valve for a scraperthat automatically times apron movement to ejector movement so thatthere is no requirement of judgment on the operators part.

The foregoing and other objects of the invention are attained by theconstruction and arrangement illustrated in the accompanying drawingswherein:

Figure 1 is a side elevational view of a two Wheel tractor and a twoWheel scraper hitched to the tractor;

Figure 2 is a schematic view of the apparatus of the present inventionfor operating the apron and ejector of the scraper;

Figure 3 is a partly side elevational and partly broken sectional viewof the valve shown in Figure 2 with the valve being in one position;

Figure 4 is a view of the valve similar to the view of Figure 3 but withthe parts thereof being in a different position;

Figure 5 is a view of the valve similar to the view of Figure 3 but withthe parts thereof being in a third position, and

Figure 6 is a cross sectional view of the valve taken on the line 6-6 ofFigure 3.

In the past it has been the practice to have one valve for directingfluid to the cylinder of the apron to raise the apron and a second valvefor directing fluid to the cylinder of the ejector to move the ejectorforward to dump the contents of the ejector and to retract the ejectorand a third valve for directing fluid to the cylinder of the bowl toraise the bowl.

The invention proposes a valve for directing fluid to the cylinder ofthe apron of a scraper to raise the apron and for directing fluid to theejector cylinder to move the ejector forward to dump the contents of thescraper and to retract the ejector. A control means is provided fordirecting fluid to the cylinder of the bowl to raise the bowl. Thisvalve has the advantage of being compact and small and it incorporatestwo valves in one and is inexpensive to make and the parts of the valvecan be replaced easily. With this valve the tractor operator has twolevers for operating the scraper instead of three as used in the pastthus making everything simpler to operate for the tractor driver. Thisvalve automatically times apron movement to ejector movement so thatthere is no requirement of judgment on the tractor operators part.

In the drawings, 10 generally designates a two wheel tractor hitched toa two wheel scraper 11. The scraper 2 ice 11 is made up of a bowl 12,wheels 13, a gooseneck 14 pivoted to the bowl, an ejector 15 mounted onthe bowl and an apron 16 pivoted on the bowl. The invention is concernedwith a valve generally designated 17 mounted on the tractor forsupplying fluid to the ejector 15 and the apron 16 for operating them.When it is desired to fill the scraper 11 with earth the bowl 12 islowered and the apron 16 is raised to expose the opening 18 in the bowlwith the ejector 15 being retracted. After the bowl 12 is filled withearth the bowl is raised up off the ground and the apron 16 is loweredto close the opening 18. The tractor 10 then pulls the scraper 11 to theplace where it is desired to unload the earth and upon reaching thisplace the apron 16 is raised to expose the opening 18 and the ejector 15is moved forward to push the earth out through the opening. Thus theapron 16 and the ejector 15 are a pair of related devices.

A pair of cylinders 19 are disposed at the sides of the apron 16 andeach cylinder is pivoted to the bowl 12 and has a piston 20 and a pistonrod 21 pivoted to the apron. A cylinder 22 is disposed centrally of thebowl 12 and is secured thereto and a piston 23 is disposed in thecylinder and a piston rod 24 is secured to the ejector 15. A cylinder 25is pivoted to the bowl 12 and has a piston therein and a piston rod 26p-rojectstherefrom and is pivoted to the gooseneck 14. A pump 27 ismounted on the engine of tractor 10 and is driven from the enginecrankshaft and an oil reservoir 28 is formed in the hitch connecting thescraper to the tractor. A conduit 29 extends between the pump 27 and thereservoir 28. A control means 30 is mounted on the tractor and haslevers 31 and 32 pivoted thereon. The control means 30 is a conventionalselector valve. A conduit 33 extends between the pump 27 and the controlmeans 30 and a conduit 34 extends between the reservoir 28 and thecontrol means.

The valve 17 is comprised of a casing 35 having a chamber 36 circular incross section and a chamber 37 circular in cross section separated fromthe chamber 36 by a partition 38. The chamber 36 has circular grooves39, 40 and 41 therein. The casing 35 is provided with openings 42, 43and 44 with the openings 43 and 44 being in alignment and incommunication with the chamber 36 through groove 39 and the opening 42being at right angles to the openings 43 and 44 and in communicationwith them. The casing 35 is also provided with an opening 45 incommunication with chamber 36 through groove 40 and an opening 46 incommunication with chamber 36 through groove 41. A passage 47 extendsfrom openings 43 and 44- to the chamber 37. A plunger 48 is slidablydisposed in the chamber 36 and has a circular head 49 of one diameterand a circular section 50 of a lesser diameter than the head and theportion of the section contiguous with the free end thereof is reducedin diameter to provide a shoulder 51. A recess 52 extends inwardly fromone end of the plunger 48 and a recess 53 extends inwardly from theother end of the plunger and is of a smaller diameter than the recess 52and merges with the recess 52 to form a shoulder 54 at the mergerlocation. The partition 38 is provided with a circular aperture 55 and apiston 56 is slidably disposed in the aperture. The piston 56 is made upof two circular sections of different diameters so that a shoulder 57 isformed between the sections. The section of the piston 56 of largerdiameter is formed with a groove and a collar 58 is disposed in thegroove. The piston 56 is provided with a slot 59 intermediate its ends.A resilient means in the form of a coil spring 60 is disposed in therecess 52 of the plunger and bears against the shoulder 54 and thecasing and urges the plunger toward the partition 38. A stop means inthe form of a snap ring 61 is disposed in a circular groove in thesection 50 adjacent the free end of the section of the plunger. Acircular sleeve 62 is slidably mounted on the section 50 of the plungerand a resilient means in the form of a coil spring 63 is mounted on thesection and bears against the head 49 and the sleeve and urges thesleeve toward the snap ring 61. A conduit 64 extends from the controlmeans 30 to the opening 42 in the casing of the valve 17 and a conduit55 extends from the opening 43 and in the casing of the valve anddivides into branches 66 and 67 which lead to the head ends of thecylinders 19 for the apron 16. A conduit 68 extends from the opening 44in the casing of valve 17 to the head end of the ejector cylinder 22 anda conduit 69 eX- tends from the rod end of the ejector cylinder to theopening 45 in the casing of the valve. A conduit 70 extends from theopening 46 in the casing of the valve to the control means 30. A conduit'71 extends from the control means 30 to the head end of the cylinder25.

Assuming the bowl 12 is in raised position and the apron 16 is inlowered position covering the opening 18 of the bowl and that theejector is retracted and it is desired to load the scraper. Referring toFigure 2 at lever 32 R means raise, 3" means hold and L means lower. Thelever 32 is moved to L so that oil in the head end of cylinder drainsout through conduit 71 into control means to conduit 34 into thereservoir 23. The oil is moved out of cylinder 25 by the weight of thebowl so that the bowl is in a lowered position with its cutting edgecontacting the ground. The lever 32 is then moved to i so that oil flowinto conduit 71 is closed oti by a closure in control means 39. Againreferring to Figure 2 at lever 31 R means raise, H hold, L lower and Ffloat. The lever 31 is moved to R. The pump 27 then moves oil throughthe control means 3%} through conduit 64 into opening 42 to fill groove39, chamber 37 and passage 47 in valve 17 with oil. Under apredetermined pressure, say for example under 500 psi. pressure,pressure in chamber 37 cannot move piston 56 which is held back by thespring 60. Oil is then moved through opening 43 into conduit 65 and intoconduits 66 and 67 to the head end of the apron cylinders 19 to raisethe apron. Oil cannot fiow into the head end of the ejector cylinder 22because oil is trapped in the rod end of the ejector cylinder by plunger48 and sleeve 62. The lever 31 is now moved to H so that the apron 16will be held in a raised position. In the H position a closure in thecontrol means 30 shuts off flow to or from the conduit 64 and oil ispumped from pump 27 to conduit 33 through the control means into conduit34 to reservoir 28 through conduit 29 baclt to the pump where this flowis repeated as long as the lever is held in the H position. The tractorIt then pulls the scraper forward until the bowl 12 is filled withearth. The lever 31 is now moved to L so that the weight or" the apron16 forces the oil out of the head ends of the apron cylinders 19 and theoil drains through conduit 65 through openings 43 and 42 into conduit 64through control means 3% into conduit 34 and into reservoir 28. Theapron lld thus moves downwardly until it is in lowered position. Thelever 32 is now moved to R so that oil from pump 27 moves throughconduit 33 and control means 30 into conduit 71 to raise the bowl 12.The lever 32 is then moved to H position. The tractor in then pulls thescraper to the place where it is desired to deposit the earth in thescraper. The lever 31 is moved to R so that the apron 1a is raised toexpose opening 18 in the bowl and upon the oil reaching thepredetermined pressure oil behind the piston 56 and its collar 58 movesthe piston to the right as shown in Figure 4 and the piston ofisetsplunger 43 from its position against partition 38 allowing pressure fromgroove 39 work on the entire plunger area. The plunger 48 and the sleeve62 move as a unit to the extreme right as shown in Figure 4 compressingspring 66 thereby connecting openings 45 and 46. Oil in the rod end ofthe ejector cylinder 22 then flows through conduit 69 into opening 45'into groove 44 and around section 5i) of the plunger into groove 41 toopening 46 and then through conduit 70 through control means 30 to thereservoir 23. The pressure in the conduit 65 maintains the apron 16 in araised position and oil under pressure flows through conduit 68 into thehead end of the ejector cylinder 22 to move the ejector 15 forward todump the earth in the bowl of the scraper. Oil in ti s,. e 72 of chamber36 drains through a number of holes 73 in the casing 35 of the valve 17and oil cannot flow through slot 5? into recess 52 of the plunger sincethe slot is closed oft" by the wall of the recess 53 of the plunger. Bymoving the lever 31 to L the control means 39 directs oil from the pump27 into the opening 16 in the casing of valve 17. Since oil underpressure is directed into the opening 45 the force on the head ofplunger is removed and spring 60 pushes the plunger back against thepartition 33. As oil under pressure is delivered into opening 46 thesleeve 62 is pushed to the left as shown in Figure 5 causing the spring63 to be compressed. Oil then passes through opening 46 into groove 41around section 58 of the plunger into groove 3% through opening 45 intoconduit 69 and then into the rod end of the ejector cylinder 22 causingthe ejector 15 to retract. Oil from the head end of the ejector cylinder2?. flows into conduit 63 through opening 44 into opening 42 intoconduit 64 through control means 30 into conduit 34 to the reservoir 23.Oil from the apron cylinders 19 is moved through conduits 66 and 67 toconduit 65 into opening 43 through opening 42 into conduit 64 throughthe control means 35? to the conduit 34 into the reservoir 28. This flowfrom the apron cylinders 19 is caused by the weight of the apron 16 andthe apron lowers itself as it moves the oil out of the head ends of thecylinders 19. The pressures in spaces 74 and 75 of chamber 36 are equalsince there is communication between these spaces through slot 59 in thepiston and the plunger 48 and sleeve 62 are in hydraulic balance. Thespring 60 maintains the plunger 43 against the partition 38. The tractorit) then pulls the scraper to the place where it is desired to refillthe scraper with earth and the operation is repeated.

What is claimed is:

1. Apparatus for providing fluid to actuate a first device and a seconddevice related to the first device comprising a valve including a casingand a first opening in communication with the interior of the casing anda second opening in communication with the interior of the casing and athird opening in communication with the interior of the casing and afourth opening in communication with the interior of the casing, fluidunder a predetermined pressure flowing through the first opening and outthe second opening to the first device to actuate the latter in onedirection, a first means in the casing responsive to fluid pressureoperative to cause communication between the third and fourth openingsupon the fluid reaching the predetermined pressure so that fluid fromthe second device can drain through the third and fourth openingsallowing fluid pressure from the second opening to actuate the seconddevice in one direction, and a second means in the casing responsive tofluid pressure operative to cause communication between the third andfourth openings upon fluid under pressure being directed into the fourthopening so that fluid from the second device can drain through the firstand second openings allowing fluid pressure from the fourth opening toactuate the second device in the opposite direction.

2. Apparatus for providing fluid to actuate a first device and a seconddevice related to the first device comprising a valve including a casingprovided with a first chamber therein and a second chamber separatedfrom the first chamber by a partition provided with an aperture thereinand a first opening in communication with the first chamber and a secondopening in communication with the first chamber and a third opening incommunication with the first chamber and a fourth opening incommunication with the first chamber and a passage from the firstopening to the second chamber, a plunger slidably positioned in thefirst chamber, a first resilient means bearing against the plunger andthe casing and urging the plunger toward the partition, stop means oneach end of the plunger, means slidably mounted on the plunger betweenthe stop means, a second resilient means bearing against one of the stopmeans and the means slidably mounted on the plunger and urging the meanstoward the other stop means, and means slidably mounted in the aperturein the partition, fluid under a predetermined pressure flowing throughthe first opening and out of the second opening to actuate the firstdevice and upon reaching the predetermined pressure fluid in the secondchamber moving the means mounted in the partition toward the firstchamber with the means moving the plunger against the pressure of thefirst resilient means allowing fluid from the second device to drainthrough the third and fourth openings and fluid flowing from the secondopening to the second device to actuate the latter in one direction andupon fluid under pressure being directed into the fourth opening thefirst resilient means moving the plunger against the partition and thefluid moving the means slidably mounted on the plunger toward said onestop means against the pressure of the second resilient means andflowing to the second device to actuate the latter in the oppositedirection and fluid from the second device flowing through the secondand first openings to drain and fluid from the first device flowingthrough the second and first openings to drain allowing the first deviceto be moved in the opposite direction.

3. Apparatus for providing fluid to actuate a first device and a seconddevice related to the first device comprising a valve including a casingprovided with a first chember therein and a second chamber separatedfrom the first chamber by a partition provided with an aperture thereinand a first opening in communication with the first chamber and a secondopening in communication with the first chamber and a third opening incommunication with the first chamber and a fourth opening incommunication with the first chamber and a passage from the firstopening to the second chamber, a plunger including a head of onedimension and a section of a smaller dimension than the head positionedin the first chamber, a first resilient means bearing against theplunger and the casing and urging the plunger toward the partition, stopmeans on the free end of the section of the plunger, a sleeve slidablymounted on the section of the plunger, a second resilient means bearingagainst the head of the plunger and the sleeve and urging the sleevetoward the stop means, and a piston disposed in the aperture in thepartition, fluid under a predetermined pressure flowing through thefirst opening and out the second opening to actuate the first device andupon reaching the predetermined pressure fluid in the second chambermoving the piston toward the first chamber with the piston moving theplunger against the pressure of the first resilient means to bring thethird opening into com munication with the fourth opening allowing fluidto move from the second device through the third and fourth openings todrain and fluid flowing from the second opening to the second device toactuate the latter in one direction and upon fluid under pressure beingdirected into the fourth opening the first resilient means moving theplunger against the partition and the fluid moving the sleeve toward thehead of the plunger against the pressure of the second resilient meansand flowing to the second device to actuate the latter in the oppositedirection and fluid from the second device flowing into the secondopening through the first opening to drain and fluid from the firstdevice flowing through the second opening and the first opening to drainallowing the first device to be moved in the opposite direction.

4. Apparatus for providing fluid to actuate a first device through .afirst cylinder and a first piston and a first piston rod in the cylinderwith the piston rod being connected to the first device and to actuate asecond device related to the first device through a second cylinder anda second piston and a second piston rod in the second cylinder with thesecond piston rod being connected to the second device, the apparatuscomprising a valve including a casing provided with a first circularchamber therein and a circular groove in the wall of the first chamberand a second chamber separated from the first chamber by a partitionprovided with an aperture therein and provided with a first opening incommunication with the first chamber and a second opening incommunication with the first chamber and a third opening incommunication with the first chamber and a fourth opening incommunication with the first chamber and a plunger including a circularhead of one diameter and a circular section of a smaller diameter thanthe head positioned in the first chamber and provided with a firstlongitudinally disposed recess therein extending inwardly from one endthereof and a second longitudinally disposed recess extending inwardlyfrom the other end thereof and of smaller diameter than the first recessand merging with the first recess to form a shoulder at the mergerlocation and a piston disposed in the aperture in the partition andprovided with a slot intermediate its ends and stop means on the freeend of the section of the plunger and a circular sleeve slidably mountedon the section of the plunger and a first resilient means disposed inthe first recess in the plunger and bearing against the shoulder in theplunger and the casing and urging the plunger toward the partition and asecond resilient means bearing against the head of the plunger and thesleeve and urging the sleeve toward the stop means, a pump, a reservoirin communication with the pump, and manually operable control means incommunication with the pump and the first and fourth openings in thecasing, fluid under a predetermined pressure flowing through the firstopening and out the second opening to actuate the first device upon thecontrol means being moved to one position and upon reaching thepredetermined pressure fluid in the second chamber moving the pistontoward the first chamber with the piston moving the plunger against thefirst resilient means to bring the third opening into communication withthe fourth opening allowing fluid to move out of the rod end of thesecond cylinder through the third and fourth openings to the reservoirand fluid flowing from the second opening into the head end of thesecond cylinder to actuate the second device and fluid flowing throughthe fourth opening allowing the first resilient means to move theplunger against the partition and the fluid moving the sleeve toward thehead of the plunger against the pressure of the second resilient meansand flowing to the rod end of the second cylinder to actuate the seconddevice in the opposite direction and fluid from the head end of thesecond cylinder flowing into the second opening through the firstopening to the reservoir and fluid from the first cylinder flowingthrough the second opening and the first opening through the controlmeans to the reservoir allowing the first device to be moved in theopposite direction upon the control means being moved to a secondposition.

References Cited in the file of this patent UNITED STATES PATENTS2,593,039 Livers et a1. Apr. 15, 1952

